Across
- 4. origin of the universe
- 6. invented the hubble telescope
- 8. found in party balloons
- 9. helped form all the matter in the universe
- 10. used to study light
Down
- 1. all matter and energy that exists
- 2. pulls things together
- 3. left over energy from the big bang
- 5. made when stars implode
- 7. one of the most abundent materials